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    <title>Document</title>
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<script>

    let dgggdf = (function () {
        function Tank() {
            this.color = 'red'
            this.run = function () {
                console.log('我是单例');
            }
        }
        let tanke = null
        return {
            ggdgd() {
                if (tanke) {
                    return tanke
                } else {
                    return tanke = new Tank()
                }
            }
        }
    })()

    let a = dgggdf.ggdgd()
    let b = dgggdf.ggdgd()
    console.log(a, b, a == b);
</script>